package com.atguigu.jue.demo02;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class MyResource{
    public synchronized void m1(){
        System.out.println(Thread.currentThread().getName()+"\t"+"---come in");
        //暂停几秒
        try { TimeUnit.SECONDS.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); }
    }
    Lock lock=new ReentrantLock();
    public void m2() throws InterruptedException {
        //if (lock.tryLock())
        if (lock.tryLock(1,TimeUnit.SECONDS)){
            System.out.println(Thread.currentThread().getName()+"\t"+"----come in");
            try { TimeUnit.SECONDS.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); }
            finally {
                lock.unlock();
            }
        }else {
            System.out.println(Thread.currentThread().getName()+"\t"+"抢锁失败");
        }
    }
}
/**
 * @auther zzyy
 * @create 2021-08-05 17:58
 * synchronized vs ReentrantLock
 *
 *  1 synchronized是java的内置关键字而ReentrantLock时java5以后的新发布的类
 *  2 synchronized一旦申请，如果获取不到锁会一直阻塞，这个阻塞的过程，用户无法控制
 */

public class SyncVsReentrantLockDemo {
    public static void main(String[] args) {

        MyResource myResource=new MyResource();
        new Thread(() -> {
                    try {
                        myResource.m2();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                },"t1").start();
        new Thread(() -> {
                    try {
                        myResource.m2();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                },"t2").start();
    }

}
